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Abstract

We performed research on a set methylammonium lead iodide (MaPI) perovskite solar cell samples, including samples produced both by vapor deposition and spin coating. We used time resolved THz spectroscopy to measure carrier mobility in the samples and excitation of vibrational modes in the THz and IR spectra to gauge relative sample compositions (ratio of PbI to Ma). Plotting carrier mobilities against composition ratios, we found a peaked distribution of carrier mobilities suggesting an ideal ratio of lead iodide to methylammonium to maximize mobility. We also observed that the spin coated samples had considerably less variance in their composition ratios compared to the vapor deposited samples, and were clustered close to the peak of the graph. However, while the vapor deposited samples displayed a much higher compositional variation, vapor deposited samples with compositions similar to the spin coated ones also had similarly high mobilities. This indicates that the vapor deposited samples aren't inherently bad, just have more variance in their compositions.

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